Axial multi-layer counter-rotating flow field reconstruction aero-mimic throttling pressure regulating device and control method

Abstract

The application relates to the field of throttling pressure regulation and discloses an axial multi-layer counter-rotating flow field reconstruction aerodynamic mimic throttling pressure regulation device and a control method. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimic throttling pressure regulation device comprises a shell, the two ends of the shell are fixedly connected with connecting shells, the inner walls of the connecting shells are uniformly fixedly connected with connecting blocks, one end of each connecting block is fixedly connected with a connecting sleeve, the inner walls of the connecting sleeves are rotationally connected with central shafts, the outer walls of the central shafts are symmetrically rotationally connected with counter-rotating fan blades, the central shafts are slidably connected with sleeve rings, and the inside of each sleeve ring is uniformly provided with an adjusting fan blade. The counter-rotating fan blades rotationally connected to the two sides of the central shaft generate two opposite rotating flows under the pushing of fluid, meanwhile, adjusting structures arranged on one side of the adjusting fan blades drive the adjusting fan blades to change the blade angles, so that the axial positions and the blade angles of the middle fan blade groups are actively adjusted in two degrees of freedom.

Description

Technical Field

[0001] This invention relates to the field of throttling and pressure regulation technology, specifically to an axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulation device and control method. Background Technology

[0002] In pipeline systems for natural gas transmission and distribution, petrochemicals, steam power, and industrial water supply, throttling and pressure regulating devices are key equipment used to reduce fluid pressure and maintain downstream pressure stability. Common throttling and pressure regulating devices include labyrinth valves, multi-stage sleeve throttling valves, and axial flow regulators. Labyrinth valves use multiple tortuous flow channels on the valve core to force the fluid to change its flow direction multiple times, utilizing local resistance to consume pressure energy and achieve step-by-step pressure reduction. Multi-stage sleeve throttling valves use a sleeve structure with multiple throttling orifices, generating pressure drop as the fluid flows through each orifice. Axial flow regulators rely on the local resistance of the flow channel inside the valve to reduce air pressure and automatically adjust the valve opening by sensing changes in outlet pressure through a diaphragm or piston, thereby achieving pressure regulation and stabilization functions.

[0003] However, under high pressure differential conditions, the pressure of the fluid drops sharply below the saturated vapor pressure when it passes through the throttling orifice, generating cavitation bubbles. When these bubbles burst, they generate high-amplitude impact forces, causing cavitation cavitation in the valve body and throttling elements, thus shortening the service life of the equipment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device and control method, which solves the problem that existing throttling and pressure regulating devices suffer from uneven flow field distribution under high pressure differential conditions, leading to sudden drops in local pressure and cavitation cavitation, thus shortening the device's service life.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device, comprising a housing, with connecting shells fixedly connected to both ends of the housing, connecting blocks uniformly fixedly connected to the inner walls of the connecting shells, a connecting sleeve fixedly connected to one end of each connecting block, a central shaft rotatably connected to the inner wall of the connecting sleeve, counter-rotating fan blades symmetrically rotatably connected to the outer wall of the central shaft, a collar slidably connected to the middle of the central shaft, adjusting fan blades uniformly arranged inside the collar, an adjusting structure provided on one side of each adjusting fan blade, a first sliding groove uniformly formed on the inner wall of the housing, a rotating ring threadedly connected to the inner wall of the housing, a connecting ring rotatably connected to one side of the rotating ring, an installation ring fixedly connected to one side of the connecting ring, a moving block uniformly fixedly connected to the outer wall of the installation ring, and a moving block slidably connected to one side of the moving block within the first sliding groove.

[0006] By adopting the above technical solution, two opposing swirling flows are generated by the symmetrically rotating fan blades connected to both sides of the central shaft under the impetus of the fluid, realizing energy dissipation throttling and pressure reduction in the first and third stages. The intermediate regulating fan blade group is formed by the collar slidably connected to the middle of the central shaft and the regulating fan blades uniformly arranged inside the collar. Through the cooperation of the rotating ring, connecting ring, mounting ring and the first sliding groove, the rotating ring drives the entire intermediate fan blade group to move axially when it rotates. At the same time, the regulating structure set on one side of the regulating fan blade drives each regulating fan blade to change the blade angle, thereby realizing the active adjustment of the axial position and blade angle of the intermediate fan blade group with two degrees of freedom. In this way, the pressure drop distribution ratio of each level in the flow field and the shear mixing intensity of the vortex flow can be actively reconstructed according to the working conditions. This achieves the homogenization of the flow field and the smooth transition of the pressure drop, solving the problem that the uneven flow field distribution of existing throttling and pressure regulating devices under high pressure differential conditions leads to local pressure drop and cavitation cavitation, which shortens the service life of the device.

[0007] Preferably, an internal gear ring is fixedly connected inside the rotating ring, and a double-sided gear ring is slidably connected to one side of the connecting ring.

[0008] Preferably, the adjusting fan blade includes a fan blade, the top of which is fixedly connected to a first rotating shaft, and the outer wall of the first rotating shaft is rotatably connected to the inside of the mounting ring.

[0009] Preferably, a second rotating shaft is fixedly connected to the bottom of the fan blade, and one end of the second rotating shaft is rotatably connected inside the collar.

[0010] Preferably, the adjustment structure includes a motor, one side of which is fixedly connected to one side of one of the moving blocks, and the output end of the motor is fixedly connected to a third rotating shaft.

[0011] Preferably, one end of the third rotating shaft is rotatably connected to one side of the connecting ring, and an electric push rod is fixedly connected to one side of the connecting ring.

[0012] Preferably, the outer wall of the third rotating shaft is uniformly fixedly connected with limiting strips, the outer wall of the limiting strip is slidably connected with a first gear, the inner wall of the first gear is slidably connected to the outer wall of the third rotating shaft, the inside of the first gear is provided with a second sliding groove, a limiting block is slidably connected in the second sliding groove of the first gear, and one side of the limiting block is fixedly connected to the output end of the electric push rod.

[0013] Preferably, the tooth tip of the first gear can mesh with the outer diameter tooth tip of the double-sided gear ring or the tooth tip of the inner gear ring, the inner diameter tooth tip of the double-sided gear ring is uniformly meshed with the second gear, the middle part of the second gear is fixedly connected to the fourth rotating shaft, and one end of the fourth rotating shaft is rotatably connected to one side of the connecting ring.

[0014] Preferably, a worm is fixedly connected to the other end of the fourth rotating shaft, the teeth of the worm are engaged with a worm wheel, and the middle part of the worm wheel is fixedly connected to the outer wall of the first rotating shaft.

[0015] A control method for an axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicking throttling and pressure regulating device, applied to the aforementioned axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicking throttling and pressure regulating device, includes the following steps: In use, the device is installed into the pipeline system through the connecting shell, so that the upstream fluid flows into the shell axially. The target axial position and target blade angle of the intermediate fan blade group are determined according to the required outlet pressure. The first gear is driven to mesh with the internal gear ring by an electric push rod, and the rotating ring is driven to rotate by a motor. The intermediate fan blade assembly is moved axially to the target position through the threaded engagement. Then, the electric push rod drives the first gear to mesh with the outer diameter teeth of the double-sided gear ring. The motor then drives the double-sided gear ring to rotate, and the second gear, worm gear and worm wheel drive each fan blade to rotate synchronously to the target angle. This causes the upstream fluid to flow through the left counter-rotating fan blade, the middle adjusting fan blade and the right counter-rotating fan blade in sequence. The pressure decreases step by step and then flows out from the other end of the casing.

[0016] This invention provides an axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device and control method. It has the following beneficial effects: 1. This invention utilizes symmetrically rotating fan blades connected to both sides of a central shaft to generate two opposing swirling flows under fluid propulsion, achieving energy dissipation-type throttling and pressure reduction in the first and third stages. An intermediate regulating fan blade group is formed by a collar slidably connected to the center of the central shaft and regulating fan blades uniformly arranged inside the collar. Through the cooperation of a rotating ring, connecting ring, mounting ring, and a first sliding groove, the rotating ring drives the entire intermediate fan blade group to move axially. Simultaneously, an adjusting structure on one side of the regulating fan blades drives each regulating fan blade to change its blade angle, thereby achieving dual-degree-of-freedom active adjustment of the axial position and blade angle of the intermediate fan blade group. This allows for the active reconstruction of the pressure drop distribution ratio and shear mixing intensity of the vortex flow at each level in the flow field according to operating conditions, achieving flow field homogenization and smooth pressure drop transition. This solves the problem of uneven flow field distribution leading to sudden local pressure drops and cavitation cavitation under high pressure differential conditions in existing throttling and pressure regulating devices, thus shortening the device's service life.

[0017] 2. This invention sets the middle adjustable fan blade assembly as a non-rotating stationary guide vane structure, and sets counter-rotating fan blades on both sides with opposite rotation directions, forming a three-layer flow field reconstruction mode of rotation-stationary-rotation. The counter-rotating fan blades on the left generate clockwise vortices, the middle stationary adjustable fan blade assembly shears, breaks up and redirects these vortices, and the counter-rotating fan blades on the right dissipate the remaining vortices in the reverse direction. This step-by-step orderly flow field reconstruction method makes the velocity and pressure distribution of the fluid in each layer in the axial direction tend to be uniform, eliminating the local vortices, backflow and flow separation phenomena commonly found in traditional throttling valves, thereby reducing the amplitude of pressure pulsation and flow-induced vibration, and improving the flow stability and regulation accuracy of the throttling and pressure regulation process.

[0018] 3. This invention fixes the motor to a moving block and sets a limiting strip and an axially sliding first gear on the third rotating shaft. Combined with the limiting block and second sliding groove driven by the electric push rod, the first gear can selectively mesh with the outer teeth of an internal gear ring or a double-sided gear ring. When the first gear meshes with the internal gear ring, the motor drives the rotating ring to rotate, driving the intermediate fan blade assembly to move axially through a threaded connection. When the first gear meshes with the outer teeth of the double-sided gear ring, the motor drives the double-sided gear ring to rotate. The inner teeth of the double-sided gear ring drive the second gear, the fourth rotating shaft, the worm, and the worm wheel, driving each fan blade in the adjusting fan blade to synchronously change its angle. Thus, a single motor and electric push rod can achieve switching between two adjustment modes: axial position and blade angle. This simplifies the structure of the drive system, reduces manufacturing costs and failure rate, and the self-locking characteristic of the worm wheel and worm gear ensures the stable maintenance of the blade angle after adjustment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device proposed in this invention; Figure 2 This is a schematic diagram of the internal structure of the housing of the axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device proposed in this invention; Figure 3 This is a partial structural diagram of the mounting ring of the axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device proposed in this invention; Figure 4 This is a schematic diagram of the internal structure of the mounting ring of the axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device proposed in this invention; Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a partial structural diagram of the first gear of the axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device proposed in this invention. Figure 7 for Figure 4 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the internal structure of the first gear in the axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device proposed in this invention.

[0020] The components are as follows: 1. Housing; 2. Connecting housing; 3. Central shaft; 4. Connecting block; 5. Counter-rotating fan blades; 6. Mounting ring; 7. Moving block; 8. Connecting sleeve; 9. Connecting ring; 10. First rotating shaft; 11. Second rotating shaft; 12. Fan blade; 13. Double-sided gear ring; 14. Internal gear ring; 15. Rotating ring; 16. Motor; 17. Third rotating shaft; 18. First gear; 19. Electric push rod; 20. Limiting strip; 21. Second gear; 22. Fourth rotating shaft; 23. Worm gear; 24. Worm; 25. Limiting block; 26. First slide groove; 27. Collar; 28. Second slide groove. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see the appendix Figure 1 -Appendix Figure 8 This invention provides an axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device, including a housing 1. Both ends of the housing 1 are fixedly connected to connecting shells 2. Connecting blocks 4 are uniformly fixedly connected to the inner wall of the connecting shells 2. One end of the connecting blocks 4 is fixedly connected to a connecting sleeve 8. The inner wall of the connecting sleeve 8 is rotatably connected to a central shaft 3. Counter-rotating fan blades 5 are symmetrically rotatably connected to the outer wall of the central shaft 3. A collar 27 is slidably connected to the middle of the central shaft 3. Adjusting fan blades are uniformly arranged inside the collar 27. An adjusting structure is provided on one side of the adjusting fan blades. A first sliding groove 26 is uniformly opened on the inner wall of the housing 1. A rotating ring 15 is threadedly connected to the inner wall of the housing 1. A connecting ring 9 is rotatably connected to one side of the rotating ring 15. An installation ring 6 is fixedly connected to one side of the connecting ring 9. A moving block 7 is uniformly fixedly connected to the outer wall of the installation ring 6. One side of the moving block 7 is slidably connected in the first sliding groove 26.

[0023] Specifically, the shell 1 has a cylindrical hollow structure with an internal flow channel for fluid to flow axially, thus providing a fluid passage and an installation base for various structures. The 2 facilitates the installation of 1 in the corresponding pipeline. The connecting shell 2 is fixedly connected to both ends of the shell 1 and can be designed as a flange or threaded type for sealing and connecting with the upstream gas source pipeline and the downstream user pipeline. The connecting block 4 and the connecting sleeve 8 are used to install the central shaft 3 at the axis of the shell 1 and the connecting shell 2. The connecting blocks 4 are evenly fixed to the inner wall of the connecting shell 2 and distributed circumferentially. The inner end of the connecting block 4 is fixedly connected to the connecting sleeve 8, which is located on the axial position of the shell 1. The inner wall of the connecting sleeve 8 is rotatably connected to the central shaft 3 through a bearing, so that the central shaft 3 can rotate freely around its own axis.

[0024] The central shaft 3 provides support for the counter-rotating fan blades 5 and the collar 27. The central shaft 3 is coaxially arranged with the housing 1, and the counter-rotating fan blades 5 are symmetrically rotatably connected to its outer wall. The two sets of counter-rotating fan blades 5 are respectively arranged on the left and right sides of the central shaft 3, and the installation angles of the two sets of fan blades are opposite. When the fluid flows axially, the fluid pushes the left counter-rotating fan blade 5 to rotate around the central shaft 3 in the first direction, and at the same time pushes the right counter-rotating fan blade 5 to rotate around the central shaft 3 in the opposite second direction, thereby realizing the counter-rotating motion of the two fan blades. During the rotation, the counter-rotating fan blades 5 do negative work on the fluid, converting the pressure energy and kinetic energy of the fluid into rotational mechanical energy and dissipating it through bearing friction and fluid viscosity, thereby realizing the first and third stage throttling and pressure reduction.

[0025] The collar 27 provides bottom rotational support for the adjusting fan blades. The collar 27 is slidably connected to the middle of the central shaft 3, that is, the collar 27 is sleeved on the outer wall of the central shaft 3 and can move axially along the central shaft 3. Multiple adjusting fan blades are evenly arranged inside the collar 27. These adjusting fan blades are distributed circumferentially to form the middle fan blade group. Through the setting of the adjusting structure, the rotating ring 15 can be driven to move on the housing 1, and the collar 27 can be driven to move axially on the central shaft 3. At the same time, the blade angle of each adjusting fan blade can be adjusted. The adjusting fan blades do not rotate with the collar 27 or the central shaft 3 in the working state and always remain circumferentially stationary. They only serve as fixed flow guiding and turbulence elements, shearing, mixing and dissipating energy of the vortices with opposite rotation directions from the two opposing fan blades 5, realizing the second stage of throttling and pressure reduction and flow field reconstruction.

[0026] The first groove 26 provides axial guidance for the moving block 7. Multiple first grooves 26 are evenly distributed on the inner wall of the housing 1, extending axially along the housing 1. The rotating ring 15 converts rotational motion into axial movement. The outer circumference of the rotating ring 15 has external threads, and the inner circumference of the housing 1 has corresponding internal threads. The rotating ring 15 is threaded to the inner wall of the housing 1. The connecting ring 9 transmits the axial movement of the rotating ring 15 to the mounting ring 6. The connecting ring 9 and the rotating ring 15... The mounting ring 6 is coaxial and can rotate relative to each other. The connecting ring 9 can move axially along with the rotating ring 15. The mounting ring 6 provides rotational support for the top of the adjusting fan blade. One side of the mounting ring 6 is fixedly connected to the connecting ring 9, forming a component that can move axially as a whole. Multiple moving blocks 7 are evenly fixedly connected to the outer wall of the mounting ring 6. One side of each moving block 7 is slidably connected to the corresponding first slide groove 26. Through the sliding cooperation between the moving block 7 and the first slide groove 26, the mounting ring 6 and the connecting ring 9 are restricted to moving only along the axial direction of the housing 1 and cannot rotate.

[0027] When the axial position of the intermediate fan blade assembly needs to be adjusted, the rotating ring 15 is driven to rotate by the adjustment structure. Since the rotating ring 15 is threadedly connected to the housing 1 and connected to the mounting ring 6 through the connecting ring 9, and the mounting ring 6 is restricted in its rotational freedom by the moving block 7 and the first sliding groove 26, the rotating ring 15 generates axial displacement during rotation. This axial displacement is transmitted to the collar 27 through the connecting ring 9, the mounting ring 6, and the adjustment structure set between the mounting ring 6 and the collar 27 in sequence, thereby driving the entire intermediate fan blade assembly to move axially along the central axis 3. By changing the axial clearance between the adjusting fan blade and the two counter-rotating fan blades 5 on both sides through the adjustment structure, the flow state of the fluid and the distribution ratio of pressure drop between different stages can be adjusted, thereby realizing continuous adjustment of the throttling degree.

[0028] When it is necessary to adjust the blade angle of each regulating fan blade, the regulating structure drives each regulating fan blade to rotate synchronously around its own axis, thereby changing the blade installation angle and adjusting the flow area and resistance coefficient of the fluid when passing through the middle fan blade group. This achieves active reconstruction of the flow field morphology, enabling the device to obtain stable throttling and pressure reduction characteristics and cavitation suppression capabilities under different operating conditions.

[0029] Through the coordinated work of various components, the upstream fluid enters from one end of the shell 1, flows through the left counter-rotating fan blade 5 to generate a clockwise vortex, then flows through the middle regulating fan blade group to be sheared and rectified, and finally flows through the right counter-rotating fan blade 5 to generate a counter-clockwise vortex. The pressure decreases step by step, and the outlet pressure is stabilized at the required value. This realizes the function of axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulation, and solves the problem that the uneven flow field distribution of existing throttling and pressure regulation devices under high pressure differential conditions leads to a sudden drop in local pressure, which in turn causes cavitation and cavitation, shortening the service life of the device.

[0030] Please see the appendix Figure 3 -Appendix Figure 7 An internal gear ring 14 is fixedly connected inside the rotating ring 15, and a double-sided gear ring 13 is slidably connected to one side of the connecting ring 9.

[0031] Specifically, the internal gear ring 14 provides an internal meshing structure for transmitting the rotational power required for axial adjustment. The internal gear ring 14 is fixed inside the rotating ring 15 and meshes with the adjustment structure. When the adjustment structure drives the internal gear ring 14 to rotate, the rotating ring 15 rotates accordingly to achieve axial position adjustment of the intermediate fan blade assembly. The double-sided gear ring 13 provides an internal and external double-sided meshing structure for transmitting the rotational power required for angle adjustment. The double-sided gear ring 13 is slidably connected to one side of the connecting ring 9 and can rotate freely around its axis. Its outer teeth mesh with the adjustment structure, and its inner teeth mesh with subsequent transmission components, thereby achieving angle adjustment of the fan blades. The parallel arrangement of the internal gear ring 14 and the double-sided gear ring 13 allows the same drive source to switch the axial position of the first gear 18, driving both axial and angle adjustment respectively. Please see the appendix Figure 2 -Appendix Figure 6 The adjustable fan blades include fan blades 12, with a first rotating shaft 10 fixedly connected to the top of the fan blades 12. The outer wall of the first rotating shaft 10 is rotatably connected to the inside of the mounting ring 6. A second rotating shaft 11 is fixedly connected to the bottom of the fan blades 12, with one end of the second rotating shaft 11 rotatably connected to the inside of the collar 27.

[0032] Specifically, the fan blades 12 form a turbulence element in the middle fan blade group, used to shear and dissipate energy from the vortices of the counter-rotating fan blades 5 on both sides. The top of the fan blades 12 is rotatably connected to the mounting ring 6 by the first rotating shaft 10, allowing the first rotating shaft 10 to rotate freely within the mounting ring 6. The bottom of the fan blades 12 is rotatably connected to the collar 27 by the second rotating shaft 11, so that the bottom of the fan blades 12 receives synchronous support when rotating. Through the cooperation of the mounting ring 6 and the collar 27, the fan blades 12 are stably clamped between the two. The first rotating shaft 10 and the second rotating shaft 11 remain coaxial, and the fan blades 12 can rotate around this axis to change their blade angle. At the same time, the entire adjustable fan blade group can achieve overall axial position adjustment through the sliding of the collar 27 on the central shaft 3 and the movement of the mounting ring 6 with the rotating ring 15.

[0033] Please see the appendix Figure 3 -Appendix Figure 8 The adjustment structure includes a motor 16, one side of which is fixedly connected to one side of one of the moving blocks 7. The output end of the motor 16 is fixedly connected to a third rotating shaft 17. One end of the third rotating shaft 17 is rotatably connected to one side of a connecting ring 9, and one side of the connecting ring 9 is fixedly connected to an electric push rod 19. Limiting strips 20 are uniformly fixedly connected to the outer wall of the third rotating shaft 17. A first gear 18 is slidably connected to the outer wall of the limiting strips 20. The inner wall of the first gear 18 is slidably connected to the outer wall of the third rotating shaft 17. A second sliding groove 28 is opened inside the first gear 18. A limiting block 25 is slidably connected in the second sliding groove 28 of the first gear 18. One side of the limiting block 25 is fixedly connected to the output end of the electric push rod 19. The teeth of the first gear 18 can mesh with the outer diameter teeth of the double-sided gear ring 13 or the teeth of the inner gear ring 14. The inner diameter teeth of the double-sided gear ring 13 are uniformly meshed with the second gear 21. The middle of the second gear 21 is fixedly connected to the fourth rotating shaft 22. One end of the fourth rotating shaft 22 is rotatably connected to one side of the connecting ring 9. The other end of the fourth rotating shaft 22 is fixedly connected to the worm 24. The teeth of the worm 24 mesh with the worm wheel 23. The middle of the worm wheel 23 is fixedly connected to the outer wall of the first rotating shaft 10.

[0034] Specifically, the motor 16 provides rotational power to the adjustment structure. The motor 16 is fixed to one of the moving blocks 7 and moves axially along with the intermediate fan blade assembly, ensuring the stability of the transmission relationship. The third rotating shaft 17 transmits the power of the motor 16 to the first gear 18. The electric push rod 19 drives the first gear 18 to move axially along the third rotating shaft 17, switching the power transmission path. The limiting strip 20 allows the first gear 18 to slide axially on the third rotating shaft 17 while simultaneously rotating synchronously with it. The cooperation between the limiting block 25 and the second sliding groove 28 converts the linear motion of the electric push rod 19 output into the axial movement of the first gear 18. The teeth of the first gear 18 mesh with the outer diameter teeth of the double-sided gear ring 13 or the inner teeth of the gear ring 14, thereby enabling the switching between angle adjustment and axial position adjustment. The second gear 21 meshes with the inner diameter teeth of the double-sided gear ring 13, and the power is evenly transmitted to each of the fourth rotating shafts 22. Through the meshing of the worm 24 and the worm wheel 23, the self-locking characteristic of the worm gear transmission is utilized to keep the blade angle of the adjusting fan blade stable after the motor 16 stops. At the same time, the rotational motion of the fourth rotating shaft 22 is transmitted to the first rotating shaft 10, thereby driving the fan blade 12 to change its angle. Through the coordinated work of the above adjustment structure, a single motor 16 and electric push rod 19 can respectively realize the axial position adjustment and blade angle adjustment of the middle fan blade group.

[0035] A control method for an axially multi-layered counter-rotating flow field reconstructed aerodynamic mimicry throttling and pressure regulating device includes the following steps: In use, the device is installed into the pipeline system through the connecting shell 2, so that the upstream fluid flows into the shell 1 axially. The target axial position and target blade angle of the intermediate fan blade group are determined according to the required outlet pressure. The electric push rod 19 drives the first gear 18 to mesh with the internal gear ring 14, and the motor 16 drives the rotating ring 15 to rotate, which in turn drives the intermediate fan blade assembly to move axially to the target position through the threaded engagement. Then, the electric push rod 19 drives the first gear 18 to mesh with the outer diameter teeth of the double-sided gear ring 13, and the motor 16 drives the double-sided gear ring 13 to rotate. The second gear 21, worm 24 and worm wheel 23 drive each fan blade 12 to rotate synchronously to the target angle, so that the upstream fluid flows through the left counter-rotating fan blade 5, the middle adjusting fan blade and the right counter-rotating fan blade 5 in sequence. After the pressure decreases step by step, it flows out from the other end of the housing 1.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device, comprising a housing (1), characterized in that: Both ends of the housing (1) are fixedly connected to connecting shells (2). Connecting blocks (4) are uniformly fixedly connected to the inner wall of the connecting shells (2). Connecting sleeves (8) are fixedly connected to one end of the connecting blocks (4). A central shaft (3) is rotatably connected to the inner wall of the connecting sleeves (8). Counter-rotating fan blades (5) are symmetrically rotatably connected to the outer wall of the central shaft (3). A collar (27) is slidably connected to the middle of the central shaft (3). Adjusting fan blades are uniformly arranged inside the collar (27). An adjusting structure is provided on one side of the adjusting fan blades. A first sliding groove (26) is uniformly opened on the inner wall of the housing (1). A rotating ring (15) is threadedly connected to the inner wall of the housing (1). A connecting ring (9) is rotatably connected to one side of the rotating ring (15). An installation ring (6) is fixedly connected to one side of the connecting ring (9). A moving block (7) is uniformly fixedly connected to the outer wall of the installation ring (6). One side of the moving block (7) is slidably connected in the first sliding groove (26).

2. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device according to claim 1, characterized in that: An internal gear ring (14) is fixedly connected inside the rotating ring (15), and a double-sided gear ring (13) is slidably connected to one side of the connecting ring (9).

3. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device according to claim 1, characterized in that: The adjustable fan blade includes a fan blade (12), and a first rotating shaft (10) is fixedly connected to the top of the fan blade (12). The outer wall of the first rotating shaft (10) is rotatably connected to the inside of the mounting ring (6).

4. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device according to claim 3, characterized in that: The bottom of the fan blade (12) is fixedly connected to a second rotating shaft (11), and one end of the second rotating shaft (11) is rotatably connected to the inside of the collar (27).

5. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device according to claim 1, characterized in that: The adjustment structure includes a motor (16), one side of which is fixedly connected to one side of one of the moving blocks (7), and the output end of the motor (16) is fixedly connected to a third rotating shaft (17).

6. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device according to claim 5, characterized in that: One end of the third rotating shaft (17) is rotatably connected to one side of the connecting ring (9), and an electric push rod (19) is fixedly connected to one side of the connecting ring (9).

7. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device according to claim 5, characterized in that: The outer wall of the third rotating shaft (17) is uniformly fixedly connected with a limiting strip (20). The outer wall of the limiting strip (20) is slidably connected with a first gear (18). The inner wall of the first gear (18) is slidably connected to the outer wall of the third rotating shaft (17). The inside of the first gear (18) is provided with a second sliding groove (28). A limiting block (25) is slidably connected in the second sliding groove (28) of the first gear (18). One side of the limiting block (25) is fixedly connected to the output end of the electric push rod (19).

8. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device according to claim 7, characterized in that: The tooth end of the first gear (18) can mesh with the outer diameter tooth end of the double-sided gear ring (13) or the tooth end of the inner gear ring (14). The inner diameter tooth end of the double-sided gear ring (13) is uniformly meshed with the second gear (21). The middle part of the second gear (21) is fixedly connected to the fourth rotating shaft (22). One end of the fourth rotating shaft (22) is rotatably connected to one side of the connecting ring (9).

9. The axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device according to claim 8, characterized in that: The other end of the fourth rotating shaft (22) is fixedly connected to a worm (24), the tooth end of the worm (24) is meshed with a worm wheel (23), and the middle part of the worm wheel (23) is fixedly connected to the outer wall of the first rotating shaft (10).

10. A control method for an axial multi-layer counter-rotating flow field reconstruction aerodynamic mimicry throttling and pressure regulating device, characterized in that: The aerodynamic mimicry throttling and pressure regulating device for axial multilayer counter-rotating flow field reconstruction as described in any one of claims 1-9 includes the following steps: When in use, the device is installed into the pipeline system through the connecting shell (2), so that the upstream fluid flows into the shell (1) axially. The target axial position and target blade angle of the intermediate fan blade group are determined according to the required outlet pressure. The first gear (18) is driven to mesh with the internal gear ring (14) by the electric push rod (19), and the rotating ring (15) is driven to rotate by the motor (16). The intermediate fan blade group is moved axially to the target position through the threaded engagement. Then, the electric push rod (19) drives the first gear (18) to mesh with the outer diameter teeth of the double-sided gear ring (13), and the motor (16) drives the double-sided gear ring (13) to rotate. The second gear (21), worm (24) and worm wheel (23) drive each fan blade (12) to rotate synchronously to the target angle, so that the upstream fluid flows through the left counter-rotating fan blade (5), the middle adjusting fan blade and the right counter-rotating fan blade (5) in sequence. After the pressure decreases step by step, it flows out from the other end of the shell (1).

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